Grupo de Sistemas Electrónicos Industriales

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Author: 43044 × End date: 2009 ×

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Now showing 1 - 2 of 2
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    Robust model-following control of parallel UPS single-phase inverters
    (Institute of Electrical and Electronics Engineers (IEEE), 2008-08) Pascual Molto, Marcos; Garcerá Sanfeliú, Gabriel; Figueres Amorós, Emilio; González Espín, Francisco José; Dpto. de Física Aplicada; Dpto. de Ingeniería Electrónica; Escuela Técnica Superior de Ingeniería Industrial; Escuela Politécnica Superior de Alcoy; Grupo de Sistemas Electrónicos Industriales
    This paper presents a robust control technique applied to modular uninterruptible power-supply (UPS) inverters operating in parallel. When compared to conventional proportional-integral (PI) control, the proposed technique improves the response of the output voltage to load steps and to high distorted output currents, reducing the distortion of the output voltage. Furthermore, an excellent distribution of currents between modules is achieved, resulting in fine power equalization between the inverters on stream. The crossover frequency of the different loop gains involved is moderate, so that robustness to variations of the operation point and to modeling uncertainties is achieved. A comparative study with a two-loop conventional PI control scheme is presented. Experimental results on a 1-kVA modular online UPS system confirm the viability of the proposed scheme.
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    Sensitivity Study of the Dynamics of Three-Phase Photovoltaic Inverters With an LCL Grid Filter
    (Institute of Electrical and Electronics Engineers, 2009) Figueres Amorós, Emilio; Garcerá Sanfeliú, Gabriel; Sandia Paredes, Jesús; González Espín, Francisco José; Calvo Rubio, Jesús; Dpto. de Ingeniería Electrónica; Escuela Técnica Superior de Ingeniería Industrial; Grupo de Sistemas Electrónicos Industriales
    [EN] An accurate small-signal model of three-phase photovoltaic (PV) inverters with a high-order grid filter is derived in this paper. The proposed model takes into account the influence of both the inverter operating point and the PV panel characteristics on the inverter dynamic response. A sensitivity study of the control loops to variations of the dc voltage, PV panel transconductance, supplied power, and grid inductance is performed using the proposed small-signal model. Analytical and experimental results carried out on a 100-kW PV inverter are presented.